A frequency-modulated quantum-cascade laser for spectroscopy of CH4 and N2O isotopomers

Year: 2005

Authors: Gagliardi G., Borri S., Tamassia F., Capasso F., Gmachl C., Sivco D. L., Baillargeon J. N., Hutchinson A. L., Cho A. Y.

Autors Affiliation: Istituto Nazionale di Ottica Applicata, Comprensorio ‘A.Olivetti’, Via Campi Flegrei 34, 80078 Pozzuoli Naples, Italy;
European Laboratory for Non-Linear Spectroscopy, via Nello Carrara 1, 50019 Sesto F. (FI), Italy; Dipartimento di Chimica Fisica e Inorganica, Università di Bologna, viale Risorgimento 4, 40136 Bologna, Italy; Division of Engineering and Applied Sciences, Harvard University, 310 Cruft Laboratory,19 Oxford Street, Cambridge, MA 02138, USA;
Department of Electrical Engineering, E-Quad B326, Princeton University, Princeton, NJ 08544, USA; Bell Laboratories, Lucent Technologies, 600 Mountain Avenue, Murray Hill, NJ 07974, USA

Abstract: We report the development of a novel laser spectrometer for high-sensitivity detection of methane and nitrous oxide. The system relies on a quantum-cascade laser source emitting wavelength of around 8.06 mu m, where strong fundamental absorption bands occur for the considered species and their isotopomers. The detection technique is based on audio-frequency and radio-frequency modulation of laser radiation. First experimental tests have been performed to estimate the achievable detection limits and the signal reproducibility levels in view of possible measurements of C-13/C-12, O-18/O-16, O-17/O-16 and N-15/N-14 isotope ratios.

Journal/Review: ISOTOPES IN ENVIRONMENTAL AND HEALTH STUDIES

Volume: 41 (4)      Pages from: 313  to: 321

More Information: The authors wish to thank Massimo Inguscio and Paolo De Natale for helpful and stimulating discussions. The work performed at Bell Laboratories, Lucent Technologies was partly supported by Darpa/US Army Research Office under contract DAAD19-00-C-0096.
KeyWords: Carbon-13; Nitrogen; Oxygen, Infrared spectroscopy; Isotopic ratio, article; Chemistry; Infrared spectrophotometry; Instrumentation; Laser; Methodology, Carbon Isotopes; Environmental Monitoring; Methane; Nitrogen Isotopes; Nitrous Oxide; Oxygen Isotopes; Spectrophotometry, Infrared
DOI: 10.1080/10256010500384572

Citations: 21
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